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Nickel Incoloy Alloy 800

Nickel Incoloy Alloy 800

Incoloy 800, 800H, and 800HT area unit nickel-iron-chromium alloys with smart strength and wonderful resistance to reaction and carburization in high-temperature exposure. These alloy steel alloys area unit identical aside from the upper level of carbon in alloy 800H, and also the addition of up to one.20 p.c atomic number 13 and metal in alloy 800HT. Incoloy 800 was the primary of those alloys and it had been slightly changed into Incoloy 800H.

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Incoloy 800, 800H, and 800HT area unit nickel-iron-chromium alloys with smart strength and wonderful resistance to reaction and carburization in high-temperature exposure. These alloy steel alloys area unit identical aside from the upper level of carbon in alloy 800H, and also the addition of up to one.20 p.c atomic number 13 and metal in alloy 800HT. Incoloy 800 was the primary of those alloys and it had been slightly changed into Incoloy 800H. This modification was to regulate carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has additional modifications to the combined metal and atomic number 13 levels (.85-1.20%) to confirm optimum warmth properties. The nickel-base alloy is twin certified (800H/HT) and combines the properties of each forms. Incoloy 800H/HT alloy was meant for prime temperature structural applications. The nickel content makes the alloys extremely proof against each chloride stress-corrosion cracking and to embrittlement from precipitation of letter section. the final corrosion resistance is great. within the resolution tempered  condition, alloys 800H and 800HT have superior creep and stress rupture properties. Today, most suppliers, together with Mega Mex, solely carry the twin certified 800H/HT alloy.

Incoloy 800 is primarily utilized in applications with temperatures up to 1100° F, wherever alloys 800H and 800HT area unit ordinarily utilized in temperatures above 1100° F wherever resistance to creep and rupture is needed. The analytical balance permits the alloy steel alloy to exhibit wonderful resistance to carburization, reaction and nitriding atmospheres. Incoloy 800HT won't become embrittled even when long periods of usage within the 1200-1600° F vary wherever several unsullied steels become brittle. wonderful cold forming characteristics generally related to the nickel-chromium alloys area unit exhibited with 800HT. once cold shaped extensively the grain size produces a visibly undulated surface referred to as “orange peel”. Incoloy 800HT will be welded by the common techniques used on unsullied steels.

Alloys 800H/HT area unit utilized in a range of applications involving exposure to corrosive environments and high temperatures akin to heat treating instrumentality, chemical and organic compound process, nuclear energy plants and also the paper pulp business. Heat-treating instrumentality akin to baskets, trays, and fixtures use Incoloy 800H/HT. Chemical and organic compound process industries use the alloys for warmth exchangers and alternative piping systems in aqua fortis media particularly wherever resistance to chloride stress-corrosion cracking is needed. Power plants use them for super-heater and re-heater conduit.

*Note that the chemical composition of Incoloy 800HT can continually be among the bounds of Incoloy 800H.

*Note the bounds of Incoloy 800H might or might not be among the bounds of Incoloy 800HT.

Alloy 800 (UNS N08800) Chemical Composition, %

NiCrFeCAlTiAl+Ti
30.0-35.019.0-23.039.5 min.10 max.15-.60.15-.60.30-1.20

Alloy 800H (UNS N08810) Chemical Composition, %

NiCrFeCAlTiAl+Ti
30.0-35.019.0-23.039.5 min.05-.10.15-.60.15-.60.30-1.20

Alloy 800HT (UNS N08811) Chemical Composition, %

NiCrFeCAlTiAl+Ti
30.0-35.019.0-23.039.5 min.06-.10.25-.60.25-.600.85-1.2

ASTM Specifications

AlloyPipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarForgingFitting
Alloy 800 (UNS N08800)B407B154B163B515B409B408B564B366
Alloy 800H (UNS N08810)B407B154B163B515B409B408B564B366
Alloy 800HT (UNS N08811)B407B154B163B515B409B408B564B366

Mechanical Properties
Typical room temperature Tensile Properties of Annealed Material

ProductTensile (ksi).2% Yield (ksi)Elongation (%)
Rod & Bar75-10030-6060-30


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